Beak morphology and song features covary in a population of Darwin's finches (Geospiza fortis)
Beak morphology and song features covary in a population of Darwin's finches (Geospiza fortis)
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DOI：
10.1111/j.1095-8312.2006.00638.x
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发表时间：
2006-07-01
影响因子：
1.9
通讯作者：
Podos, Jeffrey
中科院分区：
文献类型：
--
作者：
Huber, Sarah K.;Podos, Jeffrey
动物交配信号的进化部分是通过对影响信号表达的解剖特征的间接自然选择。例如，在鸣禽中，喙的形状和功能的自然选择可以影响歌曲特征的进化，因为喙在歌曲产生中的作用。在这项研究中，我们的特点之间的关系，喙形态和歌曲功能的双峰种群的圣克鲁斯岛，加拉帕戈斯的Geospiza fortis。这是唯一现存的达尔文雀种群，已知具有双峰分布的喙大小。我们测试的假设，即鸟类与较大的喙被约束，以产生歌曲的频率较低，降低声乐表演。我们发现，长、深、宽喙的鸟发出的歌声具有明显较低的最低频率、最高频率和频率带宽。从鸟喙形态和颤音率之间的关系的分析结果是混合的。喙形态的措施正相关与“声音偏差”，声乐表演的综合指数。总的来说，这些结果支持声道功能的共振模型，并建议喙形态，生态选择的主要目标在达尔文的雀类，影响交配信号的演变。我们认为，在歌曲之间的两种模式的分布差异可能会影响配偶识别，并可能促进通过喙的大小和人口的分歧，间接交配。(c)2006年，伦敦林奈学会。
Animal mating signals evolve in part through indirect natural selection on anatomical traits that influence signal expression. In songbirds, for example, natural selection on beak form and function can influence the evolution of song features, because of the role of the beak in song production. In this study we characterize the relationship between beak morphology and song features within a bimodal population of Geospiza fortis on Santa Cruz Island, Galapagos. This is the only extant population of Darwin's finches that is known to possess a bimodal distribution in beak size. We test the hypothesis that birds with larger beaks are constrained to produce songs with lower frequencies and decreased vocal performance. We find that birds with longer, deeper, and wider beaks produce songs with significantly lower minimum frequencies, maximum frequencies and frequency bandwidths. Results from the analysis of the relationship between beak morphology and trill rate are mixed. Measures of beak morphology correlated positively with 'vocal deviation', a composite index of vocal performance. Overall these results support a resonance model of vocal tract function, and suggest that beak morphology, a primary target of ecological selection in Darwin's finches, affects the evolution of mating signals. We suggest that differences in song between the two modes of the distribution may influence mate recognition and perhaps facilitate assortative mating by beak size and population divergence. (c) 2006 The Linnean Society of London.